From: Jim Grosbach <grosbach@apple.com>
Date: Thu, 2 Sep 2010 17:12:55 +0000 (+0000)
Subject: Anti-dependency breaking needs to be careful not to use reserved regs
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9b041c92efb5b0f6e74e154f0a6151968dc1ab58;p=oota-llvm.git

Anti-dependency breaking needs to be careful not to use reserved regs

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112832 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/AggressiveAntiDepBreaker.cpp b/lib/CodeGen/AggressiveAntiDepBreaker.cpp
index 62e40e9636b..5a634d6ccb0 100644
--- a/lib/CodeGen/AggressiveAntiDepBreaker.cpp
+++ b/lib/CodeGen/AggressiveAntiDepBreaker.cpp
@@ -654,6 +654,8 @@ bool AggressiveAntiDepBreaker::FindSuitableFreeRegisters(
     if (R == RB) R = RE;
     --R;
     const unsigned NewSuperReg = *R;
+    // Don't consider non-allocatable registers
+    if (!AllocatableSet.test(NewSuperReg)) continue;
     // Don't replace a register with itself.
     if (NewSuperReg == SuperReg) continue;
 
diff --git a/lib/CodeGen/CriticalAntiDepBreaker.cpp b/lib/CodeGen/CriticalAntiDepBreaker.cpp
index 98d4d413201..335d2d8e9ba 100644
--- a/lib/CodeGen/CriticalAntiDepBreaker.cpp
+++ b/lib/CodeGen/CriticalAntiDepBreaker.cpp
@@ -330,6 +330,8 @@ CriticalAntiDepBreaker::findSuitableFreeRegister(MachineInstr *MI,
   for (TargetRegisterClass::iterator R = RC->allocation_order_begin(MF),
        RE = RC->allocation_order_end(MF); R != RE; ++R) {
     unsigned NewReg = *R;
+    // Don't consider non-allocatable registers
+    if (!AllocatableSet.test(NewReg)) continue;
     // Don't replace a register with itself.
     if (NewReg == AntiDepReg) continue;
     // Don't replace a register with one that was recently used to repair